Ordered five minutes ago
Over here (Germany), Apple themselves had them in stock. You may be right, I also like different shades of yellow. I have both the "Yellow" as well as the "Pollen" sport band, they're both great in their own way, so if Marigold is "different" enough (as it may seem to be) I'll probably keep it. Maybe it's more of a fall colour and Sunflower is something for spring/summer.
Either way, can't wait for the Sunflower, it looks just superb in your pictures.